Quantum Fisher Information in the Generalized One-axis Twisting Model

被引：27

作者：

Liu, Wan-Fang ^{[1
,2
]}

Xiong, Heng-Na ^{[1
]}

Ma, Jian ^{[1
]}

Wang, Xiaoguang ^{[1
]}

机构：

[1] Zhejiang Univ, Dept Phys, Zhejiang Inst Modern Phys, Hangzhou 310027, Zhejiang, Peoples R China

[2] Anqing Teachers Coll, Sch Phys & Elect Engn, Anqing 246011, Peoples R China

来源：

INTERNATIONAL JOURNAL OF THEORETICAL PHYSICS | 2010年 / 49卷 / 05期

关键词：

Quantum Fisher information; One-axis twisting model; Heisenberg limit; Entanglement; STATISTICAL DISTANCE; STATE;

D O I：

10.1007/s10773-010-0286-5

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate the quantum Fisher information (QFI) of symmetric states for spin-s particles. We derive the maximal QFI, and find that quantum spin correlations are essential ingredients of the maximal QFI. We make applications to the generalized one-axis twisting model. The results show that the redistributions of uncertainties on the basis of the quantum correlations in the multiqubit system are useful for sub-shot-noise phase sensitivity. Furthermore, for high-spin (s > 1/2) composite systems, we find a sufficient criterion for entanglement.

引用

页码：1073 / 1081

页数：9

共 23 条

[21] Mean spin direction and spin squeezing in superpositions of spin coherent states
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